Allow saving of long job descriptions

Writing a detailed job description and hitting save returned "an error occurred" with nothing to act on, so people rewrote the post, tried again, and gave up. One company tried 21 times in under a minute. Descriptions past roughly 8,000 characters of formatted text were quietly hitting a limit in how the change was published behind the scenes. Length is no longer a limit, and saving works the same whether you make the edit or cord's team does.